OAKLAND, Calif. (AP)  Northern California authorities have arrested a Maryland man who they say threatened to blow up a commercial airplane as it readied for takeoff at Oakland International Airport.

The San Francisco Chronicle reports Wednesday (http://bit.ly/2ggROI8 ) that the 32-year-old man was arrested Tuesday on suspicion of making criminal threats.

The man told passengers on the Baltimore-bound Southwest Airlines plane that he was going to blow up the aircraft while it was in the sky. The captain was immediately alerted and returned the aircraft to the gate, officials said.

Alameda County sheriff’s deputies dispatched to the airport described the suspect as “unruly” and arrested him at the gate.

Alameda Sgt. Ray Kelly said no explosives were located.

The plane departed Oakland and landed safely in Baltimore later Wednesday, officials said.